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HomeAircraftHelicopterAerial Photography and Video › U-nav products? Usefull for AP?
02-07-2006 02:55 PM  12 years agoPost 1
Panomaniac

rrApprentice

Croatia - Adriatic coast

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Does anyone knows something about u-nav products? (http://www.u-nav.com) I cannot find that is has been discussed here before. Is any of them usefull for AP? I see some alitude control, airspeed control and many more. Any experiances with it?

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02-07-2006 03:36 PM  12 years agoPost 2
cwd10

rrVeteran

PA, - U.S.A.

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Five grand!!!

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02-07-2006 03:40 PM  12 years agoPost 3
HawkEyeMedia

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Fort Worth, Texas

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I emailed them before and inquired about their stabilization unit. The replies I got weren't very usefull. I thought they'd understand there might me a larger market, but they weren't interested in explaining how it worked.

It was "here it is, buy it, it's yours". Their attitude put me off. Maybe someone else will have better luck communicating with them.

Mark LaBoyteaux
HawkEyeMedia.com

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02-07-2006 03:53 PM  12 years agoPost 4
cwd10

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PA, - U.S.A.

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Also found this.

"Can any of your flight controllers be used on a helicopter ? We usually don't recommend our autopilots for helicopter applications. Helicopters have a stationary (hover) flight mode that requires special functions that our autopilots don't include. In forward flight, helicopters tend to be very unstable in pitch and roll and require a faster attitude control loop than a fixed-wing autopilot. Another unique problem with helicopters is that they create a lot of air turbulence which makes pressure sensors ineffective. Helicopters usually require a much more expensive altitude sensing system for altitude control, like a laser or radar altimeter . To help the pilot in the hover flight mode a helicopter also usually requires a special hover assist function ( Stability Augmentation System )."

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02-07-2006 04:01 PM  12 years agoPost 5
ELOSSAM

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Es

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at least you got a reply from them.

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02-08-2006 05:26 AM  12 years agoPost 6
fitenfyr

rrProfessor

Port Orchard, Washington

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Hmmm...
Somebody better tell John at CARVEC his system won't work without a laser or radar altimeter.

I also got the same sort of reply from them before.

There are other companys in the US making autopilots for UAS, but for the most part they are concentrating on the military fixed wings.

The CARVEC system is the only one I have seen that works for a helicopter at a reasonable price.

Jason Stiffey
Fly Fast....Live Slow...

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02-08-2006 06:33 AM  12 years agoPost 7
VTOL

rrNovice

Thailand

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-
Autopilot for the rc heli is too difficult. However, I already developed one system for it. May be, somebody have seen it in my post.
You can see the vdo at the following link.

http://stweb.ait.ac.th/~st027311/

The copter is a Bergen Observer EB. The Observer was used during my developement but the new copter will be developed in the near future. The auto pilot function to Auto take off, autonomous hover, waypoint nav, and also auto landing.

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02-08-2006 08:01 AM  12 years agoPost 8
Handel

rrNovice

Los Angeles, CA

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Jason,
That Carvec system looks great, but I don’t see a price list on their site. Do you know what they cost?
Craig

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02-08-2006 08:02 AM  12 years agoPost 9
fitenfyr

rrProfessor

Port Orchard, Washington

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You will have to E-mail John for current pricing and delivery times.

It ain't cheap, but if you are in need of something like that it is worth every penny IMO.

Jason Stiffey
Fly Fast....Live Slow...

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02-08-2006 08:12 AM  12 years agoPost 10
Handel

rrNovice

Los Angeles, CA

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Jason,
I was just looking for a ballpark figure. I’m not quite ready to upgrade my system, but wanted to know what the possibilities are when I do.
Thanks,
Craig

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02-08-2006 08:21 AM  12 years agoPost 11
fitenfyr

rrProfessor

Port Orchard, Washington

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Well it depends on what you want.
I make it a habit to not quote pricing on the board if it is not published. I also think it is against the RR rules...
John is a great guy to talk to shoot him an e-mail or PM and he will give you the details.

Jason Stiffey
Fly Fast....Live Slow...

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02-08-2006 08:57 AM  12 years agoPost 12
Panomaniac

rrApprentice

Croatia - Adriatic coast

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VTOL, that is cool video. Any more details of your setup?

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02-08-2006 09:04 AM  12 years agoPost 13
ELOSSAM

rrVeteran

Es

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VTOL, it´s the 3th time you pointed to the same video. Do you have any other info to share? any pict to show? or any comercial info about the unit?

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02-08-2006 10:08 AM  12 years agoPost 14
VTOL

rrNovice

Thailand

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Info
Sorry for the loss of the autopilot's info. Since, it is not for comercial. It was developed during my PhD study. I will try to put more picture on the same link. There are a limitation of only 10MB on the AIT's server. (AIT, Asian Institute of Technology) With that limitation, only 1 vdo is make its full.

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02-08-2006 10:29 AM  12 years agoPost 15
VTOL

rrNovice

Thailand

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more info
With the simple unit. The main control system consists of the followings.

1. Altitude hold, the pressure altimeter is used to provide the altitude. It works with the engine speed control. Both engine governor or a simple throttle-pitch curve can select on my designed. The engine governor give a better performance.
2. Heading Control, the heading is read from the compass. You can use both the heading hold mode or the normal mode of the gyro.
3. Position Control, this use for hovering. The GPS (4 Hz) provides XY position data.
4. Roll and Pitch Control, This is the heart of the autopilot. I cannot give more info about this part.
5. Velocity control, the GPS provides this information.

All of the control are based on the learnable controller. It mean, you not need to tune it manually. If anyone need more info, I will give it later.

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02-09-2006 07:47 PM  12 years agoPost 16
ELOSSAM

rrVeteran

Es

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Could be fine to know more about it

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02-10-2006 02:04 AM  12 years agoPost 17
VTOL

rrNovice

Thailand

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ELOSSAM,
On Monday, I will try to put picture in RR's gallery.

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02-10-2006 08:30 AM  12 years agoPost 18
ELOSSAM

rrVeteran

Es

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Ok, thanks

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